On this one I ran the 400μm logo etch 10 times, lowering the probe height by 1 micron each time. The photo shows the top of the arms of the 'u' under a higher magnification than I usually use. You can clearly see the separated ridges extending in a Northwest direction as the probe is flexed progressively out of position and in the direction of its inclination.
How high a magnification? I dunno. Too high for me to have useful light levels for general work. The objective lens is bloody close to the slide and I'm not going to risk my expensive calibration slide on it anyway!
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